Quick Answer
The average solar panel production loss after 15 years is around 15-20%. This can vary depending on factors like panel quality, exposure to weather conditions, and maintenance. Manufacturers typically guarantee a certain percentage of their panels' original output over 25-year lifetimes.
Understanding Solar Panel Degradation
Solar panel degradation refers to the decrease in energy output over time due to various factors like material degradation, temperature fluctuations, and exposure to environmental stressors. Degradation rates can be influenced by factors such as the type of solar panel, quality of manufacturing, and installation conditions. A well-maintained solar panel system with high-quality panels can experience lower degradation rates.
Measuring Degradation Rates
To measure degradation rates, manufacturers and researchers use the “efficiency loss” metric. This metric tracks the decrease in energy output over time. Typically, a high-efficiency solar panel might retain about 80-85% of its original output after 15 years, while a low-efficiency panel might retain around 70-75%. Factors like temperature and exposure to UV radiation can also impact degradation rates.
Factors Affecting Degradation Rates
Degradation rates can be influenced by various factors, including temperature, humidity, and exposure to UV radiation. High temperatures can cause solar panels to degrade faster, with studies suggesting a 0.4-0.5% decrease in efficiency for every degree Celsius above 25°C. Regular maintenance, such as cleaning and inspecting the panels, can help mitigate these effects and prolong the lifespan of the solar panel system.
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